High output alternator

[Vettepilot]

Guys, is there two different mounting bolt patterns for AD244 alternators?

I am trying to put an AD244 145 amp alternator on my 1994 K1500 GMC 5.7. My understanding was that there's only a minor mismatch that could be worked with on one of the two mounting bolt holes. Many posts I have read said that all you had to do was elongate one hole.

But look at the pics, and see the mismatch I've got going!!

Why am I having this problem? Did I get the wrong AD244??

THANKS!
Vettepilot

 

[Vettepilot]

Really? Nobody?

:~(

Vettepilot

 

[Orpedcrow]

I thought this was only applicable to the vortec trucks (95+) . Mine /1997/ bolted and plugged in like factree.

 

[tinfoil_hat]

Guys, is there two different mounting bolt patterns for AD244 alternators?

I am trying to put an AD244 145 amp alternator on my 1994 K1500 GMC 5.7. My understanding was that there's only a minor mismatch that could be worked with on one of the two mounting bolt holes. Many posts I have read said that all you had to do was elongate one hole.

But look at the pics, and see the mismatch I've got going!!

Why am I having this problem? Did I get the wrong AD244??

THANKS!
Vettepilot

I don't know the alternator model and I don't know if the Votec is different from your truck.
The guy at the parts store told me there was a high output option so I said sure. The bracket holes did not line up so I brought it back. I think you need a different belt as well.

 

[AuroraGirl]

Guys, is there two different mounting bolt patterns for AD244 alternators?

I am trying to put an AD244 145 amp alternator on my 1994 K1500 GMC 5.7. My understanding was that there's only a minor mismatch that could be worked with on one of the two mounting bolt holes. Many posts I have read said that all you had to do was elongate one hole.

But look at the pics, and see the mismatch I've got going!!

Why am I having this problem? Did I get the wrong AD244??

THANKS!
Vettepilot

you got the wrong one, try again. There are numerous AD244 alternator case designs out there, but cars with FWD usually got an AD237 not an AD244. But not all of them. RWD engines setups like these trucks will usually have the 2 ear setup for mounting.

 

[Vettepilot]

Ok guys, I think I finally got the scoop on this, after hours of research. I am somewhat at a loss as to why this info was difficult to find. The TBI trucks sometimes seem like they're the "red-headed stepchild" and quite neglected regarding available info. Not all of us have Vortecs, even if we wish we did!!

In a nutshell, it seems to basically boil down to this: most cars of this early 90's and up era apparently use a 6.062" center to center bolt hole dimension. The trucks on the other hand, have alternators with a 5.455" dimension. Of course, they are not interchangeable, as evidenced by my pics. One of the posts I had found and used for alternator upgrades recommended the alternator I bought as being a good buy and good for the swap. NOT!!

I don't know why, but this simple difference is not detailed nor discussed in the dozens of websites I searched. It is however, critical info, (of course!) I wonder why they even made this small .6" difference between car and truck alternators??

So anyway, if you want to do an upgrade and swap to a MUCH BETTER, AD244 alternator, just be sure you buy one for a 2005 or earlier TRUCK for the conversion!

(Pic shows details.)

Thanks for the replies!!

Vettepilot